Rose a écrit :
> On 10 mai, 22:47, "William Stein" <[EMAIL PROTECTED]> wrote:
>
> > Here is an example of drawing a vertical line:
> >
> > sage: line([(1/2,-2), (1/2,2)])
>
> Wow that answer was fast,
>
> Well if there a way to name it without drawing it (because I need to
> put it in an if
Oh well my problem is not because it is in a if, I can not do a ==
Infinity, I don't understand why!
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